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Variable speed hydraulic pump

  • US 20030206805A1
  • Filed: 03/12/2003
  • Published: 11/06/2003
  • Est. Priority Date: 04/14/2000
  • Status: Active Grant
First Claim
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1. A variable speed hydraulic pump, comprising:

  • a variable speed electric motor;

    a hydraulic pump unit coupled to the electric motor and a hydraulic fluid source for pumping hydraulic fluid when operated by the motor; and

    a motor controller electrically connected to the motor for supplying an electrical drive signal to the motor in response to an electrical motor load signal characteristic of said drive signal which varies dependent on the torque exerted by said motor, said electrical motor load signal characteristic being detected by said motor controller, and wherein said motor controller supplies said electrical drive signal so as to output a constant power to said pump over substantially the entire operating pressure range of said pump.

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